A man uses the social networking site Facebook on his phone in a cafe in Hanoi, Vietnam, 28 November 2013.

A man uses the social networking site Facebook on his phone in a cafe in Hanoi, Vietnam, 28 November 2013.

Luong Thai Linh / EPA

Facebook is being sued over allegations it monitors private messages on the social network to surreptitiously gather even more information on its users and share the data with marketers.

Facebook is being sued over allegations it monitors private messages on the social network to surreptitiously gather even more information on its users and share the data with marketers. (Luong Thai Linh / EPA)

Facebook is being sued over allegations it monitors private messages on the social network to surreptitiously gather even more information on its users and share the data with marketers.